This building block provides a filter with variable LP-BP-HP-Notch response, and one knob is used to gradually crossfade through all modes.

It uses a multimode filter with the LP, BP, and HP outputs connected to the inputs of a x-fade mux module (plus a separate 2-1 mixer that combines the LP+HP to provide the notch response, connected to another input of the mux). The mux crossfade effect is controlled by either a knob (D1:3) or an LFO sweep (D1:4).

The LP response is connected to both the first and last positions of the mux so that a sawtooth wave from the LFO will cause the modes to cycle through LP-BP-HP-N-LP-BP-HP-N ... etc.

However, I'm puzzled. Is the separate notch stage really necessary? I mean: if you have the LP and HP next to each other in the xmux configuration, you'll get the notch stage anyway..._________________

However, I'm puzzled. Is the separate notch stage really necessary? I mean: if you have the LP and HP next to each other in the xmux configuration, you'll get the notch stage anyway...

Ah yes, you are correct! I just did it this way because I preferred the way the knob responds. This way, full left & full right are LP, straight up is HP, and BP and Notch are both equally spaced between these.

There are lots of variations on this idea that could yield some cool results - like for example using two different sounding filters that track identically, so your LP position could be 24dB/oct with some overdrive while your HP position might be 12dB/oct and clean...._________________Dave Peck

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